<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<style type="text/css">
			div{
				width: 200px;
				height: 50px;
				text-align: center;
				color: #000000;
			}
			#d5{
				background-color: #057ED4;
				/* margin: 0 auto; */
				position: absolute;
				top: 50%;
				left: 50%;
				transform: translate(-50%,-50%);						
			}
		</style>
	</head>
	<body>
		<div id="d5">
			整个网页垂直+水平居中
		</div>
	</body>
</html>
